2-hydroxypolyalkoxy dioxaphospholane or dioxaphosphorinane



United States Patent 3,463,837 Z-HYDROXYPOLYALKOXY DIOXAPHOSPHOLANE 0R DIOXAPHOSPH'ORINANE Lester Friedman, Beachwood, Ohio, assignor to Weston Chemical Corporation, Newark, N.J., a corporation of New Jersey No Drawing. Original application Dec. 2, 1965, Ser. No. 511,215, now Patent No. 3,433,856, dated Mar. 18, 1969. Divided and this application July 18, 1968, Ser. No. 755,484

Int. Cl. C07d 105/04; C07f 9/40; C08k ]/60 US. Cl. 260-937 6 Claims ABSTRACT OF THE DISCLOSURE Compounds are prepared having the formulae where R and R are hydrogen or lower alkyl, R, is lower alkylene of at least 2 carbon atoms, x is an integer of at least 2, R is alkyl, alkenyl, aralkyl, haloaralkyl, cycloalkenyl-alkyl and halocycloalkenylalkyl, X is halogen of atomic weight 35 to 127, R is divalent hydrocarbon or divalent halohydrocarbon. Y is hydrogen or halogen of atomic weight 35 to 127, R is 2 to 4 carbon alkylene and Z is nothing or oxygen. The compounds are useful to improve the flame resistance of polyurethane and as stabilizers for halogen containing polymers and olefin polymers.

This invention relates to novel phosphorus containing compounds.

This application is a division of my copending application, Ser. No. 511,215, filed Dec. 2, 1965.

Chlorine and phosphorus containing compounds are very effective flame retardant additives for polyurethanes based on cost and efficiency. One shortcoming of the currently commercially available additives is that they lack site functionality and are unable to become chemically bound to the polymer matrix. Instead they are retained in the polymer on the basis of solution compatibility, a situation that sometimes leads to sweating, i.e. the diffusion of the additive to the surface of the polymer.

An object of the present invention is to overcome these shortcomings.

Another object is to prepare novel phosphorus compounds.

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An additional object is to prepare novel phosphorus and halogen containing compounds.

Yet another object is to improve the flame resistance of polyurethanes.

A still further object is to develop stabilizers for halogen containing polymers.

Another object is to develop stabilizers for olefin polymers.

Still further objects and the entire scope of applicability of the present invention will become apparent from the detailed description given hereinafter; it should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

It has now been found that these objects can be attained in several fashions.

In one aspect of the invention there are prepared compounds having the formula where R and R are hydrogen or lower alkyl, R is a lower alkylene group, preferably of 2 to 4 carbons, and x is an integer of at least 2 and is preferably a low integer, e.g. 2, 3 or 4.

The compounds of Formula I are conveniently prepared by reacting equimolar amounts of a vicinal glycol, a polyalkylene glycol and a tertiary phosphite of the formula where R R and R are hydrocarbyl, e.g. alkyl or aryl, or haloaryl, and removing the monohydric alcohol or phenol formed by distillation. The reaction is preferably carried out in the presence of an alkaline catalyst or a dihydrocarbyl or dihaloaryl phosphite catalyst.

Examples of compounds within Formula I are:

dipropylene glycol ethylene phosphite (also called 2-hydroxypropoxypropoxy-1,3 ,2-dioxaphospholane) dipropylene glycol propylene phosphite (also called 2-hydroxypropoxypropoxyt-methyl-1,3,2- dioxaphospholane) diethylene glycol ethylene phosphite,

diethylene glycol propylene phosphite,

tripropylene glycol ethylene phosphite,

tripropylene glycol propylene phosphite,

tetrapropylene glycol propylene phosphite,

polypropylene glycol molecular weight 2025 ethylene phosphite,

2-hydroxypropoxypropoXy-4,5-dimethyl- 1,3 ,2-

dioxaphospholane,

2-hydroxypropoxypropoxy-4-ethyl- 1,3 ,2-

dioxaphospholane,

2-hydroxypropoxypropoxy-4-pr0pyl-1,3,2-dioxapholane,

2-hydroxypropoxypropoxy-4,5-diethyl--1,3,2-

dioxaphospholane.

Another class of compounds within the present invention are compounds having the formula where R R R and x are as defined above. The compounds of Formula II are prepared in the same manner as those of Formula I but using a 1,3-type glycol rather than a vicinal glycol. Examples of compounds within Formula II are:

dipropylene glycol trimethyleneiphosphite (also called 2-hydroxypropoxypropoxy-1,3,2-dioxaphosphorinane),

dipropylene glycol 1,3-butylene phosphite (also called 2-hydroxypropoxypropoxy-4-methyl-l,3,2- dioxaphosphorinane diethylene glycol trimethylene phosphite,

tripropylene glycol trimethylene phosphite,

polypropylene glycol molecular weight 2025 trimethylene phosphite,

2-hydroxypropoxypropoxy-4,6-dimethyl-1,3,2

dioxaphosphorinane,

2-hydroxypropoxypropoxy-4-methyl-6-pr0pyll,3,2-dioxaphosphorinane,

2-hydroxypropoxypropoxy-4,6-diethyl-1,3,2-

dioxaphosphorinane.

As starting vicinal glycols for making the phosphites of Formula I there can be used ethylene glycol, propylene glycol, 2,3-butylene glycol, 1,2-butylene glycol, 1,2- pentanediol, 3,4-hexanediol, etc.

As starting 1,3-glycols for making the phosphites of Formula II there can be used trimethylene glycol, 1,3- butylene glycol, 2,4-pentanediol, 2,4-heptanediol, etc.

As polyalkylene glycols for making the compounds of Formula I and II there can be used diethylene glycol, dipropylene glycol, ditetramethylene glycol, tripropylene glycol, triethylene glycol, tetrapropylene glycol, polypropylene glycol molecular weight 2025 etc.

As the tertiary phosphite used to make the compounds of Formulae I and II there can be used trimethyl phosphite, triethyl phosphite, tripropyl phosphite, triamyl phosphite, tris octyl phosphite, tris isodecyl phosphite, tris dodecyl phosphite, tris octadecyl phosphite, triphenyl phosphite, tri o-cresyl phosphite, tri-p-cresyl phosphite, tri-m-cresyl phosphite, tri-xylenyl phosphite, phenyl diisodecyl phosphite, diphenyl p-chlorophenyl phosphite, tri p-chlorophenyl phosphite, tri-o-chlorophenyl phosphite.

Examples of suitable catalysts are dialkyl or diaryl or dihaloaryl phosphites such as diphenyl phosphite, di-ocresyl phosphite, di-p-cresyl phosphite, didecyl phosphite, diisodecyl phosphite, dioctadecyl phosphite, dimethyl phosphite, diethyl phosphite, di-o-chlorophenyl phosphite, di-2,4-dichlorophenyl phosphite or alkaline catalysts such as sodium phenolate, sodium methylate, sodium cresylate, potassium phenolate, sodium isodecylate. The alkaline catalysts preferably have a pH of at least 11 in an 0.1 N aqueous solution. The catalyst is normally used in an amount of 0.05-% by weight of the phosphite reactant.

An alternative way of preparing the compounds of Formula I and II is to react a 3-aryloxy or 2-alkoxy 1,3,2- dioxaphospholane or Z-aryloxy or 2-alkoxy 1,3,2-dioxaphosphorinane with an equimolar amount of a polyalkylene glycol in the presence of a catalyst as above specified.

The compounds of Formula II are useful in amounts of 0.1-% by weight of the polymer as stabilizers against light and polymer degradation for polyvinyl chloride, and other vinyl chloride polymers, e.g. vinyl chloride-vinylidene chloride copolymer (80:20), vinyl chloride-vinyl acetate (87:13), vinyl chloride-acrylonitrile (85:15). In the same proportions they are also stabilizers for monoolefin polymers such as polyethylene, polypropylene, ethylene-propylene copolymers (e.g. 50:50, 80:20 and 20:80) ethylene monoolefin copolymers wherein the monoolefin has 4-10 carbon atoms and is present in a minor amount, e.g. ethylene butene-l copolymer (e.g. 95:5) and ethylene-decene-l copolymer. Furthermore, they can be used in the same amounts to stabilize natural rubber, styrene-bntadiene rubber, ethylene-propylene-nonconjugated diene terpolymers, e.g. ethylenepropylene-dicyclopentadiene terpolymer (e.g. 57:42:31).

Because the compounds of Formula II have a stable dioxaphosphorinane ring they do not ring open readily and cannot be used in the Arbuzov reaction. They can be employed as reactive flame retardants for polyurethanes because they have a hydroxyl group which can take part in the reaction as a chain stopper.

The compounds of Formula I can also be employed as reactive flame retardants for polyurethanes due to their free hydroxyl group.

However, the compounds of Formula I are most valuable because they do ring open in the Arbuzov reaction. The halogen from the Arbuzov reagent becomes incorporated in the molecule upon ring opening and there is no by-product.

For maximum yields the compounds of Formula I are reacted with the Arbuzov reagent in a molar ratio of 1 mole of the Formula I compound for each reactive halogen on the Arbuzov reagent. However, less Arbuzov reagent can be used with a lower yield of product.

The Arbuzov reaction is normally carried out by heating, usually between and 200 C., preferably at -150 C.

The Arbuzov reaction for forming one type of product of the invention is as follows where R R R and x are as defined above and X is chlorine, bromine or iodine and R is alkyl, alkenyl, aralkyl, haloaralkyl, cycloalkenyl alkyl or halocycloalkenyl alkyl.

Examples of suitable R X compounds are methyl chloride, methyl bromide, methyl iodide, ethyl chloride, ethyl bromide, ethyl iodide, propyl chloride, isopropyl bromide, amyl chloride, butyl chloride, amyl bromide amyl iodide, hexyl chloride, octyl chloride, octyl bromide, octyl iodide, dodecyl chloride, dodecyl bromide, dodecyl iodide, hexadecyl chloride, octadecyl chloride, octadecyl bromide, octadecyl iodide, allyl chloride, allyl bromide, allyl iodide, octadecenyl chloride (oleyl chloride), benzyl chloride, benzyl bromide, benzyl iodide, methallyl chloride, methallyl iodide, methallyl bromide, crotyl chloride, crotyl bromide, 2,4,6-trichlorobenzyl chloride, 2,4,6-trichlorobenzyl bromide, 2,4,6-tribromobenzyl bromide, 2-chlorobenzyl chloride, 2-chloromethyl 1,4,5,6,7,7-hexachloro-bicycloheptene (having the formula H or LCrnm I 010-01 Cl and prepared by heating equimolar amounts of allyl chloride and hexachlono cyclopentadiene), 2-chloromethyl-bicycloheptene.

Examples of compounds within Formula III are:

dipropylene glycol 2-chloroethyl methane phosphonate (also called 2-hydroxypropoxypropoxy 2'-chloroethoXy methane phosphonate), dipropylene glycol 2-bromoethy1 methane phosphonate, dipropylene glycol 2-iodoethyl methane phosphonate, dipropylene glycol 2-bromopropyl methane phosphonate dipropylene glycol 2-chloropropyl methane phosphonate. dipropylene glycol 2-iodopropyl methane phosphonate, dipropylene glycol 2-chloropropyl ethane phosphonate, diethylene glycol 2-bromopropyl ethane phosphonate, tripropylene glycol 2-bron1opropyl ethane phosphonate, dipropylene glycol 2-chloroethyl ethane phosphonate, tetrapropylene glycol Z-chloropropyl ethane phosphonate,

dipropylene glycol 2-chloroe'thyl propane phosphonate,

dipropylene glycol Z-bromopropyl propane phosphonate,

dipropylene glycol 2-chloroethyl butane phosphonate,

dipropylene glycol 2-chloroethyl pentane phosphonate,

diethylene glycol 2-bromopropyl pentane phosphonate,

ditetramethylene glycol Z-chloroethyl pentane phospho nate,

dipropylene glycol 2-chloro-1-methylpropyl pentane phosphonate,

dipropylene glycol Z-brormo-l-ethylethyl pentane phosphonate,

diethylene glycol 2-iodoethyl pentane phosph onate,

dipropylene glycol 2-chloroethyl hexane phosphonate,

triethylene glycol 2-chloropropyl hexane phosphonate,

dipropylene glycol 2-chloropropyl octane phosphonate,

dipropylene glycol 2bromopropyl octane phosphonate,

dipropylene glycol 2-chloroethyl dodecane phosphonate,

dipropylene glycol 2-bromopropyl dodecane phosphonate diethylene glycol 2-chloroethyl hexadecane phosphonate,

dipropylene glycol Z-chloropropyl octadecane phosphonate, I

dipropylene glycol 2-bromoethyl octadecane phosphonate,

polypropylene glycol molecular weight 2025 2-chloroethyl pentane phosphonate,

dipropylene glycol 2-chloroethyl propene phosphonate,

diethylene glycol 2-bromoethyl propene phosphonate,

dlpropylene glycol 2-chloropropyl propene phosphonate,

dipropylene glycol 2-chloroethyl 2-methylpropene phosphonate,

dipropylene glycol 2-chlorop1'opyl octadecene phosphonate,

dipropylene glycol 2-brornoethyl octadece'ne phosphonate,

dipropylene glycol 2-chloromethyl phenylmethane phosphonate,

dipropylene glycol 2-chloropropyl phenylmethane phosphonate,

dipropylene glycol 2-brom'oe'thyl phenylmethanephosphonate,

diethylene glycol 2-chloroethyl phenylmethane phosphonate,

dipropylene glycol 2-chloroethyl 2,4,6-trichlorophenylmethane phosphonate,

dipropylene glycol 2-chloroethyl bicycloheptenylme'thane phosphonate,

dipropylene glycol 2'-chloroethyl l,4,5,6,7,7-hexachlorobicycloheptenylmethane phosphonate (having the formula dipropylene glycol 2'-chloropropyl 1,4,5,6,7,7-hexachlor0- bicycloheptenylmethane phosphonate.

According to the invention there can also be employed the Arbuzov reaction to react the compounds of Formula I with Arbuzov reagents having two reactive halogen atoms. In such case if two moles of the compound of Formula I are reacted with one mole of the Arbuzov reagent :1 bis phosphonate is formed. However, if only one mole of the compound of Formula I is employe there will be formed a monophosphonate having a haloalkyl substitute. The equation for the reaction is as follows:

nr-ono 2 Po(R30)xu xmx where R R R X and'xare as defined above and R is a divalent hydrocarbon or halohlydrocarbon group wherein the two free valences are attached to aliphatic carbon atoms. Preferably the XR X compound either has halogen atoms, most preferably chlorine or bromine in addition to the Arbuzov reactive halogen atoms or has aliphatic unsaturation which can be eliminated through addition of chlorine or bromine across the double or triple carbon to carbon bond. Such a reaction is shown in the following equation Where DPG stands for dipropylene glycol" with one OH removed.

CHzO

CH2O

By replacing the bromine by chlorine in this reaction the corresponding compound having 4 chlorine atoms is formed.

A similar reaction can be carried out by replacing the 1,4-dichlorobutene by 1,4-dichlorobut.yne. In such case the final product will have either 2 chlorine atoms and 4 bromine atoms or will have 6 chlorine atoms depending on whether bromine or chlorine is used to react acros the triple bond.

Examples of compounds having the formula XR X are 1,4-dichlorobutene, (both cis and trans isomers as well as a mixture of such isomers), 1,4-dichlorobutyne, 1,4-dibromobutene, 1,4-dichlorobutane, 1,4-dibromobntane, xylylene dichloride, tetrachloro-xylylene dichloride, tetrabromoxylylene dibromide, 2,3di(chloromethyl) 1,4, 5,6,7,7-hexachloro-S-norbornene (HET dichloride).

Examples of compounds within Formula IV are:

butane bis (dipropylene glycol 2-chloroethyl phospho nate),

butene bis (dipropylene glycol 2-chloroethyl phosphonate),

butene bis (dipropylene glycol Z-chloropropyl phosphonate),

butene bis (diethylene glycol Z-chloroethyl phosphonate),

butene bis (dipropylene glycol 2-bromoethyl phosphonate),

2,3-dichlorobutene bis (diethylene glycol 2'-chloroethyl phosphonate 2,3-dichlorobu-tene bis (dipropylene glycol 2'-chloroethyl phosphonate 2,3-dichlorobutene bis (dipropylene glycol 2-chloropropyl phosphonate),

2,3-dichlorobutene bis (dipropylene glycol 2-bromopropyl phosphonate).

2,3-dichlorobutene bis (tripropylene glycol 2-chloroethyl phosphonate),

2,3-dibromobutenc bis (dipropylene glycol 2'-chloroethyl phosphonate 2,3-di-bromobutene bis (dipropylene glycol 2'-bromopropyl phosphonate),

2,3-dibromobutene bis (diethylene glycol 2'-bromoethyl phosphonate 2,3-dichlorobutane bis (diethylene glycol 2'-chloropropyl phosphonate),

2,3-dichlorobutane bis (dipropylene glycol 2-chloroethyl phosphonate) 2,3-dichlorobutane bis (dipropylene glycol 2'-chloropropyl phosphonate),

2,3-dichlorobutane bis (dipropylene glycol 2-bromopropyl phosphonate),

2,3-dichlorobutane bis (tripropylene glycol 2'-chloroethyl phosphonate 2,3-dibromobutane bis (dipropylene glycol 2'-bromopropyl phosphonate),

2,3-dibromobutane bis (diethylene glycol 2-brom0ethyl phosphonate 2,2,3,3-tetrachlorobutane bis (dipropylene glycol 2- chloroethyl phosphonate),

2,2,3,3-tetrachlorobutane bis (diethylene glycol 2'-chloropropyl phosphonate),

2,2,3,3-tetrabromobutane bis (dipropylene glycol 2- chloroethyl phosphonate),

2,2,3,3-tetrabromobutane bis (dipropylene glycol 2'- bromoethyl phosphonate) xylylene bis (dipropylene glycol 2-chloroethyl phosphonate),

xylylene bis (dipropylene glycol 2-chloropropyl phosphonate),

xylylene bis (diethylene glycol 2-chloroethyl phosphonate),

xylylene bis (dipropylene glycol 2'-bromoethyl phosphonate),

tetrachloroxylylene bis (dipropylene glycol 2-chloro ethyl phosphonate),

tetrachloroxylylene bis (dipropylene glycol 2-chloropropyl phosphonate),

tetrabromoxylylene bis (dipropylene glycol 2-bromoethyl phosphonate),

tetrachloroxylylene bis (diethylene glycol 2-chloroethyl phosphonate) HET bis (dipropylene glycol 2-chloroethyl phosphonate) having the formula O CIhCHzCl l O ODPG HET bis(dipropylene glycol 2-bromoethyl phosphonate).

HET bis(dipropylene glycol 2-chloropropyl phosphonate).

HET bis(diethylene glycol 2-chloroethyl phosphonate).

HET bis(tetrapropylene glycol 2-chloroethyl phosphonate).

Also according to the invention there can be employed the Arbuzov reaction to react compounds of Formula I with tertiary mono and dihaloalkyl phosphite and phosphates wherein the haloalkyl groups have 2 to 4 carbon atoms. If 1 mole of the tris(haloalkyl) phosphite or phosphate is reacted with 1 mole of the compound of Formula 1 there is produced a compound having the formula VII 8 where X, Y, R R R Z, R and x are as defined above. I Illustrative starting phosphites and phosphates for preparing the compounds of Formulae VII and VIII are:

tri(3,3-dichloropropyl) phosphite, tris(3,3-dichloropropyl) phosphate, tris(2,3-dichloropropyl) phosphite, tris(2,3-dichloropropyl) phosphate, tris(4,4-dichlorobutyl) phosphite, tri(4,4-dichlorobutyl) phosphate, tris(2,2-dichloroethyl) phosphite, tris(2,2-dichloroethyl) phosphate, tris 1,2-dichloroethyl) phosphite, tris(1,2-dichloroethyl) phosphate, tris(3-chloropropyl) phosphite, tris(3-chloropropyl) phosphate, tris (4-chlorobutyl) phosphite, tris(4-chlorobutyl) phosphate, tri(2-chloroethyl) phosphite, tris(Z-chloroethyl) phosphate, tri(2-chloropropyl) phosphite, tris(Z-bromoethyl) phosphate, tris(3-bromopropyl) phosphite, tris(2,2-dibromoethyl) phosphate.

Examples of compounds within Formula VII are:

bis(2-chloroethy1) phosphato dipropylene glycol 2- chloroethyl ethane phosphonate (having the formula bis(2-chloroethyl) phosphato dipropylene glycol 2- chloroethyl ethane phosphonate,

bis(2-chloroethyl) phosphito diethylene glycol 2- chloroethyl ethane phosphonate.

Examples of compounds within Formula VIII are:

tris(dipropylene glycol 2-chloroethyl phosphonatoethyl) phosphate (having the formula tris dipropylene glycol 2-chloroethyl phosphonate ethyl) phosphite,

tris(diethylene glycol 2-chloroethyl phosphonatoethyl) phosphate,

tris(dipropylene glycol 2-bromoethyl phosphonatoethyl) phosphite,

tris(dipropylene glycol 2-chloroisopropyl phosphonatoethyl) phosphate,

tris(dipropylene glycol 2-chloroisopropyl phosphonatoethyl) phosphite,

tris(dipropylene glycol 2-chloroethyl phosphonato lchloroethyl) phosphate,

tris(dipropylene glycol 2-chloroethyl phosphonatepropyl) phosphite,

tris(tripropylene glycol 2-chloroethyl phosphonatopropyl) phosphate,

tris(dipropylene glycol 2-chloroisopropyl) phosphonatobutyl) phosphate.

The compounds of Formulae III, IV, VII and VIII are all useful as flame retardant additives for polyurethanes. Since they all contain a free hydroxyl group they can be chemically bound to the polymer matrix if they are added, for example, along with the polyol employed in making the polyurethane. The compounds of Formulae III and VII can be used to control the polymer chain growth as chain stoppers since they have only a single hydroxyl group. The compounds of Formulae IV and VIII on the other hand contain a plurality of hydroxyl groups and hence can contribute to the overall increase in chain length. In fact they can beused as. the sole polyol, e.g. to react with toluene diisocyanate to form a polyurethane.

The compounds of Formulae III; IV, VII and VIII can also be added to polyurethane prepolymers to give flame retardant; properties to the composition. They also are useful as flame retardant agents for polyesters, e.g. styrene modified dipropylene glycol rnaleate adipate, and can be added as reactants prior to the formation of the polyester. They also are useful as flame retardants for hydrocarbon polymers such as polyethylene, polypropylene, ethylene-propylene-unconjugated diene terpolymers, etc.

Unless otherwise indicated all parts and percentages are by weight.

Example 1 A mixture of 76 grams (1 mole) of propylene glycol, 134 grams (1 mole) of dipropylene glycol, 310 grams (1 mole) of triphenyl phosphite and grams of sodium phenate (catalyst) to keep the system basic was heated to 120-150 C. at 15 mm. Hg pressure. The phenol formed via the transesterification reaction was removed through a plate fractionating column. Towards the end of the reaction the pressure was lowered to 1-2 mm. to facilitate complete removal of the phenol. The residual liquid after treatment with Attagel (attapulgus clay and Hi-Flo (filter aid), followed by filtration at 75 C. was dipropylene glycol propylene phosphite, a clear, waterwhite liquid of the following structure CH;CHO

P-ODPG OHz-O Ultraviolet analysis indicated that no more than 0.5% phenol was present.

Example 2 The procedure of Example 1 was repeated replacing the propylene glycol by 1 mole of methylene glycol to produce dipropylene glycol ethylene phosphite, a liquid having the formula CHzO P- DPG Example 3 The procedure of Example 1 was repeated replacing the propylene glycol by 1 mole of trimethylene glycol to produce dipropylene glycol trimethylene phosphite, a liquid having the formula CHzO +112 \P0DPG 011,0

Example 4 1 mole of dipropylene glycol propylene phosphite as prepared in Example 1 was heated with 1 mole of amyl chloride at C. for 4 hours to form dipropylene glycol 2-chloropropyl pentane phosphonate, a liquid having the formula Example 5 1 mole of dipropylene glycol ethylene phosphite as prepared in Example 2 was heated with 1 mole of octyl bromide at 130 C. for 4 hours to form dipropylene glycol 2-bromoethyl octane phosphonate as a liquid.

Example 6 1 mole of dipropylene glycol ethylene phosphite was heated with 1 mole of allyl chloride at 130 C. for 4 hours to form dipropylene glycol 2-chloroethyl propene phosphonate, a liquid having the formula This product added bromine across the double bond to give dipropylene glycol 2-chloroethyl 2,3-di-bromo propane phosphonate.

Example 7 1 mole of dipropylene glycol ethylene phosphite was heated with 1 mole of benzyl bromide for 4 'hours at C. to form dipropylene glycol 2-chloroethyl phenylmethane phosphonate, a liquid having the formula 1 mole of dipropylene lycol ethylene phosphite was heated with 1 mole of 2-chloromethyl 1,4,5,6,7,7-hexachlorobicycloheptene (HET monochloride) for 4 hours at 135 C. to form dipropylene glycol 2-chloroethyl 1,4,5, 6,7,7-hexachlorobicycloheptenyl methane phosphonate.

Example 9 2 moles of dipropylene glycol ethylene phosphite was heated with 1 mole of 1,4-dibromobutene at 130 C. for 4 hours to form butene bis (dipropylene glycol 2-bromoethyl phosphonate) as a liquid having the formula This product readily added 1 mole of bromine across the double bond to form 2,3-dibromobutane bis (dipropylene glycol 2-bromoethyl phosphonate).

Example 11 2 moles of dipropylene glycol ethylene phosphite was heated with 1 mole of 1,4-dichlorobutyne at 130 C. for 4 hours to form butyne bis (dipropylene glycol 2-chloro ethyl phosphonate) as a liquid.

This product readily added 2 moles of bromine across the triple bond to form 2,2,3,3-tetrabromobutane bis (dipropylene glycol Z-chloroethyl phosphonate).

1 1 Example 12 2 moles of dipropylene glycol ethylene phosphite was heated with 1 mole of tetrachloroxylylene dichloride at 140 C. for 4 hours to produce tetrachloroxylylene bis (dipropylene glycol 2-chloroethyl phosphonate) as a liquid having the formula Example 1 mole of tris (2-chloroethyl) phosphate and 1 mole of dipropylene glycol ethylene phosphite were heated at 125-150 C. for 3 hours to give his (Z-chloroethyl) phosphato dipropylene glycol 2-chloroethyl ethane phosphonate as a light pale yellow liquid.

Example 16 1 mole of tris (2-bromoethyl) phosphite and 1 mole of dipropylene glycol propylene phosphite were heated at 140 C. for 3 hours to give his (2-br0moethyl) phosphito dipropylene glycol 2'-bromoisopropyl ethane phosphonate as a liquid.

Example 17 1 mole of tris (2-chloroethyl) phosphite and 3 moles of dipropylene glycol ethylene phosphite were heated at 125l50 C. for 4 hours to give tris (dipropylene glycol 2-chloi'oethyl phosphonatoethyl) phosphate as a liquid.

1 2 Example 18 1 mole of tris (Z-bromoethyl) phosphite and 3 moles of dipropylene glycol ethylene phosphite were heated at C. for 4 hours to give tris (dipropylene glycol 2- bromomethyl phosphonatoethyl) phosphate as a liquid.

I claim:

1. A compound having formula selected from the group consisting of R1-CHO (RaO)xH Ra HO and (b) Rr-CHO CH2 P-O (R OMH RzCHO where R and R are selected from the group consisting of hydrogen and lower alkyl, R is a lower alkylene group of at least 2 carbon atoms and x is an integer of 2 to about 35.

2. A compound according to claim 1 which has Formula a and in which x is an integer of 2 to 4.

3. A compound according to claim 2 which is dipropylene glycol propylene phosphite.

4. A compound according to claim 2 which is dipropylene glycol ethylene phosphite.

5. A compound according to claim 1 which has Formula b and in which x is an integer of 2 to 4.

6. A compound according to claim 5 which is dipropylene glycol trimethylene phosphite.

References Cited UNITED STATES PATENTS 3,194,795 7/1965 Friedman 260-937 XR CHARLES B. PARKER, Primary Examiner A. H. SUTTO, Assistant Examiner U.S. Cl. X.R. 

